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Lempel–Ziv Ross Williams (LZRW) refers to variants of the LZ77lossless data compressionalgorithms with an emphasis on improving compression speed through the use of hash tables and other techniques. This family was explored by Ross Williams, who published a series of algorithms beginning with LZRW1 in 1991.
The variants are:
LZRW1
LZRW1-A
LZRW2
LZRW3
LZRW3-A
LZRW4
LZRW5
The LZJB algorithm used in ZFS is derived from LZRW1.
Williams, R.N., "An Extremely Fast Ziv-Lempel Data Compression Algorithm", Data Compression Conference 1991 (DCC'91), 8–11 April 1991, Snowbird, Utah, pp.362-371
